LOCATION TUMBLE OR
Tentative Series
DCR/KMS
01/2017
TUMBLE SERIES
Landscape--western Cascade Mountains
Landform--cirque headwalls, drainageways of mountain slopes
Slope--30 to 90 percent
Parent material--colluvium derived from hard extrusive igneous rock mixed with volcanic ash throughout
Mean annual precipitation--about 2600 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Medial-skeletal, amorphic Pachic Fulvicryands
TYPICAL PEDON: Tumble gravelly medial loam on a north-facing, 50-percent slope at an elevation of 1305 m, under deciduous shrubs (When described on June 24, 2015, the soil was dry from the surface to a depth of 2 cm, slightly moist from a depth of 2 to 35 cm, and moist from a depth of 35 to 150 cm.)
Oi--0 to 2 cm; slightly decomposed plant material; 1 percent andesite gravel, 1 percent andesite cobbles, and 1 percent andesite stones; abrupt wavy boundary
Oa--2 to 8 cm; highly decomposed plant material, very dark grayish brown (10YR 3/2) dry, very dark brown (7.5YR 2.5/2) moist; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine to very coarse roots; many very fine interstitial pores; 1 percent andesite gravel, 1 percent andesite cobbles, and 1 percent andesite stones; very strongly acid (pH 4.8); abrupt wavy boundary
A1--8 to 35 cm; gravelly medial loam, dark brown (10YR 3/3) dry, very dark brown (7.5YR 2.5/2) moist; moderate fine granular structure and weak fine subangular blocky; soft, very friable, nonsticky and nonplastic; common very fine, fine, coarse, and very coarse and many medium roots; many very fine interstitial pores and common very fine tubular pores; 15 percent andesite gravel, 3 percent andesite cobbles, and 2 percent andesite stones; very strongly acid (pH 5.0); clear wavy boundary
A2--35 to 150 cm; very stony medial loam, brown (10YR 4/3) dry, dark brown (7.5YR 3/2) moist; moderate fine granular structure and weak fine subangular blocky; soft, very friable, nonsticky and nonplastic; few fine and very coarse and common medium and coarse roots; many very fine interstitial pores and common very fine tubular pores; 5 percent andesite gravel, 15 percent andesite cobbles, 20 percent andesite stones, and 10 percent andesite boulders; very strongly acid (pH 5.0)
TYPE LOCATION: Marion County, Oregon, about 6 km north of Detroit Dam, in Willamette National Forest; about 330 m north and 50 m west of the southeast corner of section 19, T. 9 S., R. 5 E.; latitude 44.77356, longitude -122.23580, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Dry days--15 to 30 consecutive days following summer solstice
Mean annual soil temperature--4 to 6 degrees C
Thickness of umbric epipedon--greater than 150 cm (below mineral soil surface)
Melanic index--greater than 1.7
Reaction--4.5 to 5.5 throughout mineral horizons
Thickness of andic soil properties--greater than 150 cm (below mineral soil surface)
Estimated properties of layers with andic soil properties
*1/3-bar bulk density--less than 0.9 g/cm3
*Ammonium oxalate extractable Al + 1/2 Fe--2 to 4 percent
*Phosphate retention--greater than 85 percent
*15-bar water retention--30 to 70 percent (undried samples), greater than 15 percent (dried samples)
*Volcanic glass content in 0.02- to 2.0-mm fraction--5 to 30 percent
*0.02- to 2.0-mm fraction--greater than 30 percent
Particle-size control section
*Clay content--10 to 18 percent
*Total rock fragment content--35 to 60 percent
Oi horizon
*Thickness--0 to 5 cm
Oe horizon (where present) and Oa horizon
*Thickness--5 to 10 cm
A1 horizon
*Hue--10YR, 7.5YR
*Value--2 or 2.5 moist, 3 or 4 dry
*Chroma--1 to 2 moist, 2 or 3 dry
*Fine-earth texture--medial loam
*Clay content--10 to 18 percent
*Sand content--30 to 45 percent
*Total fragment content--15 to 35 percent
*Gravel content--5 to 35 percent
*Cobble content--0 to 10 percent
*Stone content--0 to 5 percent
*Organic carbon content--10 to 20 percent
*Thickness--25 to 50 cm
A2 horizon
*Hue--7.5YR, 10YR
*Value--3 moist, 4 or 5 dry
*Chroma--2 or 3 moist or dry
*Fine-earth texture--medial loam, medial silt loam
*Clay content--10 to 18 percent
*Sand content--30 to 45 percent
*Total fragment content--35 to 60 percent
*Gravel content--10 to 50 percent
*Cobble content--5 to 35 percent
*Stone content--0 to 30 percent
*Boulder content--0 to 20 percent
*Organic carbon content--7 to 12 percent
COMPETING SERIES:
Stetattle--particle-size control section averages less than 10 percent clay; 30 to 60 percent volcanic glass in upper part
GEOGRAPHIC SETTING:
Elevation--900 to 1700 m
Aspect--generally north facing
Climate--cool, dry summers; cold, wet winters
Mean annual precipitation--2300 to 2900 mm
Mean annual air temperature--5 to 7 degrees C
Frost-free period--60 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Talapus--firm or very firm rupture resistance below a depth of 75 to 150 cm; in concave positions of cirque floors
Thader--50 to 100 cm deep to lithic contact; on north-facing cirque headwalls and mountain slopes
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation during normal years--none within profile
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high or very high throughout
USE AND VEGETATION:
Use--wildlife habitat, watershed management
Potential natural vegetation--deciduous shrubland composed of Sitka alder, salmonberry, western mountain ash, red elderberry, Pacific bleeding heart, youth on age, white avalanche-lily, starry false Solomon's seal, Oregon oxalis
DISTRIBUTION AND EXTENT: Western Cascade Mountains, Oregon; MLRA 3; small extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Willamette National Forest, Marion County, Oregon; 2015; name from Tumble Lake, near the type location
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Particle-size control section--zone from 8 to 108 cm
*Umbric epipedon--zone from 8 to 150 cm
*Andic soil properties--zone from 8 to 150 cm
*Volcanic glass--zone from 8 to 150 cm
06/2016--Assumed to meet criteria 2 (no ash required) for andic soil properties, in the 12th edition of Keys to Soil Taxonomy. It is also assumed that enough ash is present for the soils to meet criteria 3. Additional lab data is needed to confirm the degree of ash influence.
ADDITIONAL DATA: Typical user pedon ID--2015OR047793
National Cooperative Soil Survey
U.S.A.